In the beginning it was good, everything was good including people. But sin came and took everything that was once good and corrupted it, including people. At this point humans have a sinful nature and are evil and hopeless.
However this isn't the end of the story because Jesus comes.
He comes and dies in our place and changes everything. He redeems us. He saves us from our sin and restores us. His death bridges the gap between us and God and He allows us to be reunited with him.
When he leaves the earth the Holy Spirit comes and dwells among us.
For people who proclaim to be Christians and have accepted the Holy Spirit, they now have the Holy Spirit living inside them.
We are now guided by the Holy Spirit so in that sense we are good. However, we still live in a world full of sin and we still have sinful flesh so we cannot be perfect.
Sad to say our human souls are trapped in sinful flesh (bodies) that have a sinful appetite. This explains why "good" people, although they do good things can never be perfect. Because of God's grace, the Holy Spirit acts as a guide and leads us towards making the right decision, however until we are reunited with God we can't experience the good and true nature that humanity had in the beginning of creation. For right now we only get glimpses of what God originally intended the world to be. It is not humans who are good but rather God who is good and working through us who helps us to fight our sinful flesh.
My dad likes to say that the line between good and evil runs down each of our hearts. Instead of just a yes naturally evil or naturally good it is a mix because we have a soul that craves to return to it's intended good state but it is trapped inside a sinful body and they are constantly at battle, the Holy Spirit helps us to fight that internal conflict and gives us guidance and power to make wise decisions. No one is perfect, God is perfect, and because He loves us He sent his son to restore us, we get a glimpse of what a perfect world would be like.
I have a few biblical references from where I have made my conclusions.
Galatians 5:16-17 Live by the Spirit, I say, and do not gratify the desires of the flesh. For what the flesh desires is opposed to the Spirit, and what the Spirit desires is opposed to the flesh; for these are opposed to each other, to prevent you from doing what you want.
Ecclesiastes 7:29 But I did find this: God created people to be virtuous, but they have each turned to follow their own downward path.
2 Corinthians 5:17 This means that anyone who belongs to Christ has become a new person. The old life is gone; a new life has begun!
